This is just the inherent nature of the beast.

这不过就是她的野兽本能。

Because of certain societal expectations, people engage in a battle against their inherent nature, instead of flowing along with the attributes that nature has given them.

由于某些社会期望，人们与他们的固有的本性进行斗争，而不是跟随大自然赋予他们的属性。